Specialist Task Force 358:
Update of TBR38 for Speech terminals with PSTN access, when implementing
tests with HATS –
Head And Torso Simulator
Who we are:
Team Leader and expert:
Jean-Francis Dolidet
Why we do it:
TC STQ has developed a program based on wideband speech. In
this context, new standards for speech terminals have been created
TC STQ has also provided or proposed support to other bodies (e.g. TC
DECT) in order to have compatible standards guaranteeing a high level of Quality
for wideband speech transmission.
When developing wideband speech terminal standards, and
considering the designs of new generation handsets, it was needed to implement
test methods based on the use of HATS (Head And Torso Simulator) to qualify the
electro-acoustical performance of terminals. As the most of the terminals
implementing wideband speech (150 Hz to 7 kHz) also supports narrow-band speech
(300 Hz – 3400 Hz), it was logical to use the same test equipments for the
different bandwidths.
In some cases, new terminals may be associated with PSTN
access, through gateways, wireless bases etc… which need to fulfil PSTN
standards such as TBR38. However, as
TBR 38 is an "historic" standard, the test methods have not evolved as the
design of the new speech terminals. To solve this issue, a new set of test
methods have to be implemented in an updated version of TBR38, these methods
being based on the use of HATS. It shall be noted that the update will not
affect the existing test methods which will remain as they are, but will add new
test methods applicable to new speech terminals with PSTN Access.
For more details, see our
Terms of Reference
How we do it:
As TBR are no more produced by ETSI. The content of the ES that will be produced
as an update of the TBR38 will need to:
- extract from TBR 38 the relevant requirements and
test methods that will remain in the EN, in order to maintain the contents
similar to the existing ones for PSTN designed for TBR38
-
identify the new test methods and requirements to
be included for new speech terminals to be tested with a HATQS
- adapt the test methods using HATS to ensure
compatibility in the requirements between TBR 38 and the updated standards.
Four tasks have been identified. Except task 1 that will be done first, the 3
other tasks will progress in parallel:
- Task 1: to create an EN based on the existing
clauses of TBR38
- Task 2: to adapt the new methodologies both to
PSTN access and parameters (and
associated test methods) defined in TBR 38 This task will begin by a collection,
a review and an analysis of the existing materials (in TC STQ and other SDOs).The
result will be the new draft EN
- Task 3: to test 2 speech terminals in order to
ensure that the updated test methods and associated requirements are finely
tuned.
- Task 4: to organise conf calls and e-mail
discussions and to participate to STQ meeting in order to finalize the document
Task 1 will be presented at STQ#29 meeting, and a discussion about evolution of
this draft will be conducted.
Task 2 and 4 will be conducted using existing standards and points of discussion
will be solved by e-mail of conf-call. A stable ES draft will result from those
tasks.
Task 3 : 2 PSTN terminals will be tested according the ES draft and results will
be examined in order to see wether new requirements are realistic.
Time plan for the work:
The STF will produce the following deliverable, for TB approval:
DEN/STQ-00129 - attachment
requirements and test methods for terminal equipment incorporating a handset
function connected to the analogue interface of the PSTN, according to the
following time scale:
- Start of work:
end September 2008
- Stable draft for TB approval:
14 November 2008
- TB approval:
STQ#30 meeting (1-5 December 2008)
How to contact us:
STF Leader and expert : Jean-Francis Dolidet TES Electronic Solutions
jean-francis.dolidet@tesbv.com
Tel : (33)2 98 10 30 15
Fax: (33)2 98 10 30 01
Postal Adress : 50 rue du Pdt Sadate
29337 Quimper Cedex. France
This information is based upon STF working assumptions.
The views expressed do not necessarily represent the position of ETSI in this
context.
Last updated: 2013-04-13 17:31:06